Continuous evaporation crystallization system and method for one-step production of large-size food-grade potassium chloride crystals

Abstract

The present invention relates to a continuous evaporation and crystallization system and method for producing large-grain food-grade potassium chloride crystals in one step. The system is composed of two parts: an evaporation system and a crystallization system, and can continuously realize the production of large-grain food-grade potassium chloride in one step. The method includes: The potassium chloride solution is heated and concentrated through the evaporation system, and then pumped to the crystallization system for continuous evaporation and crystallization to obtain the potassium chloride crystal slurry. After the crystal growth is completed, the potassium chloride crystal slurry is discharged and transported to the buffer tank; the conditions include: The feed potassium chloride feed liquid directly enters the circulation pipeline of the separation chamber, mixes with a large amount of potassium chloride concentrated liquid, forms a high-temperature and high-saturated solution through two-effect heat exchange, and then mixes it with a large amount of potassium chloride crystal slurry, and exchanges heat through an external circulation Raise the temperature and pressure of the potassium chloride material, send it to the crystallizer for flash evaporation and concentration, and crystallize and precipitate potassium chloride crystals. According to the method provided by the invention, the obtained food-grade potassium chloride crystal has a large average particle size, uniform particle size distribution and high yield.

Description

technical field

[0001] The invention belongs to the technical field of evaporation crystallization, and in particular relates to a continuous evaporation crystallization system and method for producing large-diameter food-grade potassium chloride crystals in one step. Background technique

[0002] Food grade potassium chloride is white powder or colorless crystal, odorless, salty, non-toxic, easily soluble in water, soluble in glycerin, slightly soluble in ethanol. Food-grade potassium chloride is mainly used to produce low-sodium salt to meet the direct potassium supplement of the human body. It is used as a salty agent and nutritional supplement to partially replace salt to prevent people from excessive intake of salt; it can be used for oral administration in medicine, and can also be used to prepare water for injection. It plays the role of supplementing or balancing the potassium deficiency of the human body, and it can also make diuretics and prevent potassium deficien...

Examples

Embodiment 1

[0058] This embodiment is used to illustrate the food-grade potassium chloride crystal provided by the present invention and its production method.

[0059] The potassium chloride solution is transported to the circulation pipeline of the III-effect separation chamber through the feed pump, and after being flashed and concentrated by the III-effect heat exchanger and the III-effect separation chamber, the material is transported to the II-effect crystallizer through the III-effect discharge pump. The circulation pipeline is further flashed and concentrated, and then transported to the circulation pipeline of the I-effect separation chamber through the II-effect transfer pump after the II-effect concentration, through the heat exchange of the I-effect heat exchanger and the high-temperature flash concentration of the I-effect separation chamber, and then passed through the pipeline The pressure difference is transported to the circulation pipeline of the II-effect crystallizer, ...

Embodiment 2

[0061] This embodiment is used to illustrate the food-grade potassium chloride crystal provided by the present invention and its production method.

[0062] The potassium chloride solution is transported to the circulation pipeline of the III-effect separation chamber through the feed pump, and after being flashed and concentrated by the III-effect heat exchanger and the III-effect separation chamber, the material is transported to the II-effect crystallizer through the III-effect discharge pump. The circulation pipeline is further flashed and concentrated, and then transported to the circulation pipeline of the I-effect separation chamber through the II-effect transfer pump after the II-effect concentration, through the heat exchange of the I-effect heat exchanger and the high-temperature flash concentration of the I-effect separation chamber, and then passed through the pipeline The pressure difference is transported to the circulation pipeline of the II-effect crystallizer, ...

Embodiment 3

[0064] This embodiment is used to illustrate the edible potassium chloride crystal provided by the present invention and its production method.

[0065] The potassium chloride solution is transported to the circulation pipeline of the III-effect separation chamber through the feed pump, and after being flashed and concentrated by the III-effect heat exchanger and the III-effect separation chamber, the material is transported to the II-effect separation chamber through the III-effect discharge pump. The circulation pipeline is further flashed and concentrated, and then transported to the circulation pipeline of the I-effect crystallizer through the II-effect transfer pump after the II-effect concentration, and then evaporated and crystallized, and the temperature of the feed liquid is raised to 110 At about ℃, the concentration of potassium chloride is 36% (w / w), the material enters the circulation pipe of the I-effect crystallizer for evaporation and crystallization, the circul...

technical field

[0001] The invention belongs to the technical field of evaporation crystallization, and in particular relates to a continuous evaporation crystallization system and method for producing large-diameter food-grade potassium chloride crystals in one step. Background technique

[0002] Food grade potassium chloride is white powder or colorless crystal, odorless, salty, non-toxic, easily soluble in water, soluble in glycerin, slightly soluble in ethanol. Food-grade potassium chloride is mainly used to produce low-sodium salt to meet the direct potassium supplement of the human body. It is used as a salty agent and nutritional supplement to partially replace salt to prevent people from excessive intake of salt; it can be used for oral administration in medicine, and can also be used to prepare water for injection. It plays the role of supplementing or balancing the potassium deficiency of the human body, and it can also make diuretics and prevent potassium deficien...

Examples

Embodiment 1

[0058] This embodiment is used to illustrate the food-grade potassium chloride crystal provided by the present invention and its production method.

[0059] The potassium chloride solution is transported to the circulation pipeline of the III-effect separation chamber through the feed pump, and after being flashed and concentrated by the III-effect heat exchanger and the III-effect separation chamber, the material is transported to the II-effect crystallizer through the III-effect discharge pump. The circulation pipeline is further flashed and concentrated, and then transported to the circulation pipeline of the I-effect separation chamber through the II-effect transfer pump after the II-effect concentration, through the heat exchange of the I-effect heat exchanger and the high-temperature flash concentration of the I-effect separation chamber, and then passed through the pipeline The pressure difference is transported to the circulation pipeline of the II-effect crystallizer, ...

Embodiment 2

[0061] This embodiment is used to illustrate the food-grade potassium chloride crystal provided by the present invention and its production method.

[0062] The potassium chloride solution is transported to the circulation pipeline of the III-effect separation chamber through the feed pump, and after being flashed and concentrated by the III-effect heat exchanger and the III-effect separation chamber, the material is transported to the II-effect crystallizer through the III-effect discharge pump. The circulation pipeline is further flashed and concentrated, and then transported to the circulation pipeline of the I-effect separation chamber through the II-effect transfer pump after the II-effect concentration, through the heat exchange of the I-effect heat exchanger and the high-temperature flash concentration of the I-effect separation chamber, and then passed through the pipeline The pressure difference is transported to the circulation pipeline of the II-effect crystallizer, ...

Embodiment 3

[0064] This embodiment is used to illustrate the edible potassium chloride crystal provided by the present invention and its production method.

[0065] The potassium chloride solution is transported to the circulation pipeline of the III-effect separation chamber through the feed pump, and after being flashed and concentrated by the III-effect heat exchanger and the III-effect separation chamber, the material is transported to the II-effect separation chamber through the III-effect discharge pump. The circulation pipeline is further flashed and concentrated, and then transported to the circulation pipeline of the I-effect crystallizer through the II-effect transfer pump after the II-effect concentration, and then evaporated and crystallized, and the temperature of the feed liquid is raised to 110 At about ℃, the concentration of potassium chloride is 36% (w / w), the material enters the circulation pipe of the I-effect crystallizer for evaporation and crystallization, the circul...

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